HIMA HIMatrix F3 AIO 8/4 01, Руководство пользователя

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F3 AIO 8/4 01 4 Start-up
HI 800 161 E Rev. 2.00 Page 43 of 56
4.5.2 Connecting Wired Mechanical Contacts
Wired mechanical contacts are connected as described in Figure 11 and Figure 12. Wired
mechanical contacts are connected to the analog inputs using the Z 7308 shunt adapter. The
shunt adapter protects the analog inputs against overvoltage and short-circuits from the field
zone.
The supply voltage must be set to 26 V.
4.5.2.1 Wired Mechanical Contacts with Resistance Values of 2 k Ω and 22 k Ω
Wired Mechanical Contact
Line Resistance of < 50
Ω
Z 7308 Shunt Adapter
Protective Circuit within Z 7308
F3 AIO 8/4 01 Remote I/O
Supply
Analog Input
Ground
Figure 11: Wired Mechanical Contact
Switching Thresholds of the Analog Inputs
The switch-on and switch-off thresholds, the open-circuit (OC) and short-circuit (SC) thresholds
and the corresponding fault reaction must be configured in the user program. The line
resistance has already been taken into account with the limits.
Switching
threshold Value Description
Switch-on
threshold L
 H
> 5 V [1000 digits] Transition from Low to High
Switch-off
threshold H
 L
< 4 V [800 digits] Transition from High to Low
OC Limit < 0.4 V [80 digits] Fault reaction to be configured:
Set the input value to zero.
SC Limit > 11 V [2200 digits] Fault reaction to be configured:
Set the input value to zero.
Table 36: Thresholds for the Inputs with Wired Mechanical Contacts